I have a 2010 2554 GCW and the bumpers that I was using left very strange marks on the port side panels. I tried every spray in the world this past spring trying to remove them to no avail. I've found the only way to remove is to you a polishing compound, unfortunately it leaves the panel with a dull finish. I tried using a different wax that was less abrasive but it's still dull. Any suggestions out there on how to get these black panels looking new again? I'm extremely anal about my boats and this is killing me.